Swing looks great! You could play much better than a 17.7 with a little work for sure.

Biggest thing I see is a really nice setup and back swing, but then just no hip movement at all on the down swing. Instead of getting your weight forward you're mostly just posting up and spinning in place. Take a look at this thread:

You also dip your head a bit on the back swing but it doesn't move front or back noticeably so personally I think the hip thing is more important. Getting the weight forward at impact is really key.

I like the short stroke. Everything looks in control. Might want to lengthen it out just a tad eventually, but I like it. Also, you're setting the ball up way back in your stance, almost like opposite the recommended driver setup with it just off your back foot. That will contribute to low ball flight for sure.